御兄さん[oniisan] older brother
御兄ちゃん[oniichan] familiar form of "older brother"
御兄弟[gokyoudai] siblings
家兄[kakei] (my) elder brother
雅兄[gakei] polite word in letter to friend

義兄[gikei] brother-in-law
兄さん[niisan] older brother
兄嫁[aniyome] elder brother's wife
兄貴[aniki] one's senior

吾れ[are] I
吾子[ako] my child
吾妹子[wagimoko] my wife
吾人[gojin] we
吾妹[wagimo] my wife

吾亦紅[waremokou] burnet
吾嬬[azuma] east
吾が[waga] my
吾が輩[wagahai] I (nuance of arrogance)
吾ら[warera] we